Snack food



FIG. 1 is a front view of a snack food showing my new design, the rear view being identical;

FIG. 2 is a right-side view thereof, the left-side view being identical;

FIG. 3 is a top view thereof; and,

FIG. 4 is a bottom view thereof.

The broken lines illustrate portions of the snack food and form no part of the claimed design. 

The ornamental design for a snack food, as shown and described. 